Very interesting.
If I understand it correctly, the RA was allocated a block of squadron numbers for their new AOP sqns just prior to WWII, starting with 651 Sqn. These were then adopted by the AAC in 1957 and are still going strong.
The latest squadron is 677 Sqn AAC (V), a TA ground support sub-unit within 6 Regt, re-badged from RA(V) to feed the mighty Apache. With a prevailing wind, the next one after that should be 678 Sqn AAC(V).
Now 677 has taken its badge and motto from its predecessor unit, 202 Bty RA(V). Are there any conventions that dictate what can and cannot chosen for 678 ? I ask because there is a very nifty motto for 644 Sqn: "Dentes draconis serimus" ("We sow dragon's teeth "). The badge is also rather fetching and links nicely to 16 AA Bde:
http://www.raf.mod.uk/history/h644.html
http://www.rafweb.org/Sqn621-650.htm
However, 7644 Sqn RAuxAF claims a golden thread to this unit but has a completely different badge and motto.
Could one just pinch the badge and motto anyway ??